Beckett and the boys help Alexis and Rick from afar as they try to solve a murder on a plane on Castle. "In Plain Sight" is the 21st episode of the show's seventh season.
But we have an even bigger question and it has nothing to do with murder. If Castle and Beckett dive back in to his mysterious disappearance, will Esposito have Castle's back this time?
It's always good to see Kate and Lanie sharing some girl talk on Castle. We don't see it often enough. "Sleeper" is the 20th episode of the show's seventh season.